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What do you feel is a reasonable OCI for synthetic #4693174
03/13/18 08:07 AM
03/13/18 08:07 AM
Joined: May 2002
Posts: 20,777
Oakville, Ontario
Patman Offline OP
Patman  Offline OP
Joined: May 2002
Posts: 20,777
Oakville, Ontario
When this site first started it seemed most members would try to push their intervals as long as possible on synthetic, but I feel like that has changed in recent years and even my own way of thinking has changed as well, for various reasons. So I decided to start this topic to see what people on here now feel is a reasonable OCI using an OTC synthetic (not one of the extended performance ones either but something like regular M1, Castrol Edge or Pennzoil Platinum) When I say reasonable, I mean what OCI do you feel gives you good value for your money but also doesn't push the limits too far? For me I used to try and go a lot longer (10-15k in some cases) but I've now scaled that back a bit and feel a bit more comfortable keeping the OCI closer to 6k (which is a nice even 10,000 km for me) Is there anyone on here that still feels like they need to do 3000 mile intervals even with synthetic?


2018 Corvette (M1 5w30 ESP Formula & Fram Ultra)
2006 Civic EX Coupe (PUP 5w20 & Fram Ultra)
2010 BMW 328i X-Drive (GC 0w40 & Fram Ultra)

Re: What do you feel is a reasonable OCI for synthetic [Re: Patman] #4693177
03/13/18 08:11 AM
03/13/18 08:11 AM
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,480
Ontario, Canada
Both my BMW and Honda I change at 6000 km. Its about $40 to do an oil change ($29 on Honda, $50 on BMW) practically free.

I should also add, my cars get driven, hard, and get a LOT of short trips. I work only 5 km from home. Civic is a winter car that gets used on track in the summer, BMW is summer only but sees some track use and is significantly more HP than stock, currently 400 hp/420 lb.ft.

Last edited by mightymousetech; 03/13/18 08:25 AM.

Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
2013 BMW 135i M Sport Edition Castrol 0W40, Redline MTL
Re: What do you feel is a reasonable OCI for synthetic [Re: Patman] #4693183
03/13/18 08:16 AM
03/13/18 08:16 AM
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Only the highest performance engines need synthetic changed every 3K. Outside of that, it really depends - my Cruze with the 1.4 gas turbo (port injected) gained a bad reputation in its first few years partly because the 10K OLM calibration was too much, especially for syn blend Dexos1 oil. They scaled it back to 7,500 before my car was made, but I've run 5K intervals because the car always sees some amount of mixed driving and I can waste 2,500 mi. worth of OCI for a long time before it outweighs the cost of a turbo. I run Schaeffer's syn blend @ 4-5K in my '85 GMC and Schaeffer's full syn @ 5K in my diesel Mercedes. If I had a newer, run-of-the-mill NA engine that saw a lot of highway miles I'd run 6-8K, maybe 10K depending on what it is, but there's a difference between what OCI will keep an engine in one piece for 200K and what will keep it spotless inside for at least that long. It depends.


I like Chevy and Valvoline.

'13 Cruze, 1.4T, 113K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 169K
'67 Suburban, 350, 331K
Re: What do you feel is a reasonable OCI for synthetic [Re: Patman] #4693184
03/13/18 08:17 AM
03/13/18 08:17 AM
Joined: Aug 2004
Posts: 4,629
Katy, Republic of Texas
blupupher Offline
blupupher  Offline
Joined: Aug 2004
Posts: 4,629
Katy, Republic of Texas
Depends on driving conditions.

For a short tripper vehicle, then 5000 miles is still my max.

For a regularly driven vehicle with a mix of short and long trips, 7500-10,000 miles.

If only highway miles, up to 15,000 miles.

These numbers are for engines that do not have direct injection or boosted.

If I had a DI turbo engine, I would cut the mileage almost in half (so yes, 3,000 mile interval with synthetic on a short tripper vehicle).


1994 Honda VT1100: Peak 15w-40/PSL/2500 mile OCI
2002 Ford F150: GTX HM 5w-20/EcoGard Syn/1yr OCI
2012 Scion xB: QSUD 0w-20/CQ Blue/5k OCI

Re: What do you feel is a reasonable OCI for synthetic [Re: Alex_V] #4693185
03/13/18 08:19 AM
03/13/18 08:19 AM
Joined: May 2002
Posts: 20,777
Oakville, Ontario
Patman Offline OP
Patman  Offline OP
Joined: May 2002
Posts: 20,777
Oakville, Ontario
Originally Posted By: Alex_V
but there's a difference between what OCI will keep an engine in one piece for 200K and what will keep it spotless inside for at least that long.


I think that's why my thoughts have changed recently, as I do feel that even if the oil can still do a decent job beyond 6k, I also feel that if I want to keep things spotless inside then I need to keep the intervals lower than I previously did. I do believe in getting more value for my oil filter dollar though and am going to be leaving my filters on for two intervals (except on the Corvette because of the powertrain warranty)

Re: What do you feel is a reasonable OCI for synthetic [Re: Patman] #4693186
03/13/18 08:19 AM
03/13/18 08:19 AM
Joined: Dec 2017
Posts: 2,302
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 2,302
SE British Columbia, Canada
I use the GM OLM for my 2008 Chev 6.0, but thatís usually 6000 to 6500 miles. For me it works out to 2 changes per year: one after the winter and one after the summer. I buy SN Dexos approved synthetic oils on sale and donít worry about the latest and greatest feature. 150,000 miles on my engine and runs great with no oil consumption. Knock wood.


If you want the job done right......do it yourself.
Re: What do you feel is a reasonable OCI for synthetic [Re: Patman] #4693187
03/13/18 08:22 AM
03/13/18 08:22 AM
Joined: Mar 2016
Posts: 940
PA,US
HemiHawk Offline
HemiHawk  Offline
Joined: Mar 2016
Posts: 940
PA,US
I typically go for 5k miles or 1 year. Oil is so cheap.


2016 Nissan Frontier Pro4x
2017 VW GTI sport
1995 Mustang GTS
Re: What do you feel is a reasonable OCI for synthetic [Re: Patman] #4693191
03/13/18 08:25 AM
03/13/18 08:25 AM
Joined: Feb 2015
Posts: 2,194
Slovenia EU
Kamele0N Offline
Kamele0N  Offline
Joined: Feb 2015
Posts: 2,194
Slovenia EU
@around 15.000kms...


2011 Hyundai i30 1.4 CVVT Shell Helix Ultra 5w40
1997 Toyota Landcruiser KZJ95 3.0 TD Shell Rimula R6M 10w40
Re: What do you feel is a reasonable OCI for synthetic [Re: Patman] #4693192
03/13/18 08:25 AM
03/13/18 08:25 AM
Joined: Jan 2017
Posts: 292
Ontario, Canada
newbe46 Offline
newbe46  Offline
Joined: Jan 2017
Posts: 292
Ontario, Canada
8,000 KM and I know it is hardly scientific. I ran a UOA by Blackstone and they are fine with that as well.


2003 E46 M3 Convertible
2004 Odyssey EX-L
2004 Impreza TS Wagon
Re: What do you feel is a reasonable OCI for synthetic [Re: blupupher] #4693194
03/13/18 08:27 AM
03/13/18 08:27 AM
Joined: May 2002
Posts: 20,777
Oakville, Ontario
Patman Offline OP
Patman  Offline OP
Joined: May 2002
Posts: 20,777
Oakville, Ontario
Originally Posted By: blupupher
If only highway miles, up to 15,000 miles.

These numbers are for engines that do not have direct injection or boosted.

Because of the DI on my Corvette (and the 2% fuel I saw in my first UOA) I'm still not sure where my comfort zone lies just yet there. I don't plan on following the OLM just yet, my next oil change will be with only 3000 miles or so on the current oil.

For highway trips, I do feel confident that they put very little stress on the oil. So for example if we did a 3k trip on the BMW, I'd have no problem extending that particular OCI from 6k to 9k.

Re: What do you feel is a reasonable OCI for synthetic [Re: Patman] #4693201
03/13/18 08:46 AM
03/13/18 08:46 AM
Joined: Oct 2005
Posts: 11,363
PA
d00df00d Offline
d00df00d  Offline
Joined: Oct 2005
Posts: 11,363
PA
Completely depends on:

- Vehicle
- Usage
- Driving conditions
- Condition of engine
- Type of oil

Tons of cold starts and short trips in the dead of winter, engine prone to fuel dilution, tiny sump, low-SAPS oil: 3k seems reasonable

All gentle highway driving, moderate temps, low humidity, tight clean-running engine, huge sump, oil designed for long OCIs: 15k+

Track use: 1 session


2011 Mazda RX-8 R3
Mobil Super 5w-20
Re: What do you feel is a reasonable OCI for synthetic [Re: Patman] #4693206
03/13/18 09:00 AM
03/13/18 09:00 AM
Joined: Nov 2011
Posts: 4,850
MTL, CANADA
Rolla07 Offline
Rolla07  Offline
Joined: Nov 2011
Posts: 4,850
MTL, CANADA
I dont think I feel its necessary to do 3k intervals but I usually change my oil between 5000-9000kms. (3-6k miles) For me it depends on timing, I like to change oil in Spring once the temps are regularly over 7 or 8 degrees celsius so it depends how much Ive driven since last OC in November. So far Im only at 3300km, just over 2k miles, so I believe it is likely that I will change it in about a month at Im guessing 3k miles. Also, I bring my kid to daycare and get him twice daily 4 days a week and all are short trips about 2 miles return. I do get the oil hot at least once a week but figure I am severe service. Im not concerned about getting the most out of syn oil. Syn oil isnt that expensive once you consider 2$ specials or mail in rebates. Im quite content doing 3k changes but its not to say its necessary, pretty confident that 10-12k kms in a well maintained engine is a safe bet. Follow mfr recommended interval seems good to me.


2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967

Re: What do you feel is a reasonable OCI for synthetic [Re: Patman] #4693208
03/13/18 09:00 AM
03/13/18 09:00 AM
Joined: Dec 2002
Posts: 42,085
New Jersey
JHZR2 Offline
JHZR2  Offline
Joined: Dec 2002
Posts: 42,085
New Jersey
Since the start of this website, OLMs have gotten better, manufacturers have generally extended OCIs a bit, and engine power densities have changed substantially...

I found long ago, with old engines and past-tech synthetic oils, that the non-severe duty OCI could be used in severe service when a good syn is employed.

That has not changed, IMO. The thing that has changed is more and better OLM algorithms have directly informed if severe service is incurred. I think that generally their findings reflect the finding I had years ago.

So following an OLM is an appropriate approach, with the correct spec oil.

Following the non-severe service interval with employment of a quality syn oil works.

If one is truly running a severe service, UOA is prudent to determine if it is affecting modern formulated oils.

Re: What do you feel is a reasonable OCI for synthetic [Re: Patman] #4693210
03/13/18 09:02 AM
03/13/18 09:02 AM
Joined: May 2010
Posts: 2,024
Illinois, U.S.A
RamFan Offline
RamFan  Offline
Joined: May 2010
Posts: 2,024
Illinois, U.S.A
Way too many variables involved to make a blanket statement. I believe this is why more and more manufacturers are transitioning to OLM systems. That being said, they're not all as accurate as GM's and doing a few UOAs to gauge their accuracy is important. Using my Mazda as an example, it doesn't seem to factor in cold weather/idle nearly as much as it should which is why I see fuel dilution during winter OCIs.


06 Monte Carlo LT
+3.9l V6 - 191k - DuraBlend 10w30 - EcoGard Synthetic - OLM
16.5 CX-5 Touring
+2.5l I4 - 48k - SynPower w/ Maxlife 0w20 - PureOne - 8k/1yr
Re: What do you feel is a reasonable OCI for synthetic [Re: Patman] #4693212
03/13/18 09:03 AM
03/13/18 09:03 AM
Joined: Oct 2015
Posts: 2,649
Balearic Islands , Spain
FordCapriDriver Online content
FordCapriDriver  Online Content
Joined: Oct 2015
Posts: 2,649
Balearic Islands , Spain
It' impossible to say X amount of miles is when you should change synthetic motor oil.
The amount of variables that come into play are just too much.


1975 Ford Capri II Ghia 3000 V6, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.

1988 Ford Escort Mk4 Xr3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.
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